Hoisting mechanism



I o v I 2 o M m g a War a m m f 2 Guyfl. filackwood April 15, 1930. G.R. BLACKWOOD HOISTING MECHANISM Filed June 15, 1928 Patented Apr. 15,1930 UNITED STATES PATENT OFFICE GUY R.- BLACKWOOD, F COLUMBUS, OHIO,ASSIGNOR TO CAPITAL LIFT AND MANU- FACTURING COMPANY, OF COLUMBUS, OHIO,A CORPORATION OF OHIO HOISTING MECHANISM Application filed June 15,

This invention relates to hoisting apparatus such as is used in sidewalkhoist-ways and the like for raising ash cans and other loads from acellar to sidewalk levels.

The present invention has for its objects, among others, to provide asimple yet durable and efficient hoisting mechanism applicable tovarious types of hoistways and movable therein to assume collapsed orextended positions.

It is another object of the invention to provide a hoisting mechanismwhich is operated by means of an electrical motor, whereby a shaft maybe raised or lowered in a hoistway to effect the raising and lowering ofan associated receptacle, and wherein provision is made for arrestingautomatically the operation of the driving motor when such shaftapproaches the extremities of its collapsed so and extended positions ofmovement.

It is another object of the invention to connect the refuse receivingreceptacle with the extensible shaft so that as said shaft raises andlowers the refuse receptacle will be moved in unison therewith butpreferably at an accelerated rate of travel.

With these and other objects in view which will appear as thedescription proceeds, the invention consists in the novel features of 39construction, combinations of elements and arrangements of partshereinafter to be fully described and pointed out in the appendedclaims.

In the accompanying drawings:

5 Figure 1 is a vertical sectional view taken through a hoistwayillustrating the hoisting apparatus comprising the present inventionsituated therein,

Figure 2 is a vertical sectional view showing the swivel connectionbetween the hoisting boom and the screw shaft,

Figure 3 is a detail sectional view taken through the head of thesupporting casing and disclosing more particularly the driving mechanismfor this screw shaft,

Figure 4. is a horizontal sectional view on the line H of Figure 3,

Figure 5 is a diagrammatic view of the electrical circuits used forcontrol of operation of the driving motor.

1923. Serial No. 285,753.

Referring more particularly to the drawings the numeral 1 designates ahoistway of the type commonly found in connectionwith street sidewalksfor the purpose of removing ashes and other refuse from a cellar,

permitting such refuse to be elevated to a position above the street orsidewalk level so that it may be discharged into a truck or othercarrier and conveniently removed.

The numeral 2 designates the sidewalk in .3

Adapted to be positioned within the hoistway is a hoisting mechanism 6.This mechanism comprises a casing 7 which has its lower end suitablysecured as at 8 to a concretebase 9. The casing may be of any suitableheight but preferably terminates immediately adjacent to the under sideof the sidewalk 2 in a 10 which supports an enlarged housing 11. Thehousing is also connected at one side by means of a strap 12 with theframe 4.

Connected with the housing and suspended from one end thereof is areversible electrical motor 13, the armature shaft 1a of which isprovided with a pinion 15 arranged horizontally for rotation within thehousing 11. The pinion 15 meshes with a gear 16 which is provided with athreaded hub 17 adapted for the reception of a vertically extendingscrew. shaft 18, the latter being adapted to be telescoped within thecasing 7 when not in use and to be projected to a considerable distanceabove the height of the sidewalk when in active use. It will be seenthat upon the. rotation of the motor armature 13 rotary movement will beimparted to the gear 16, since the latter is rotatably confined withinthe stationary housing 11 vertical motion is imparted to the shaft 18. I

The upper end of the shaft 18 includes a socket 19 in which is recived aking pin 20 which is carried by a dependent on the intermediate portionof a hoisting boom 21. The

king in 20 permits the boom to turn horizonta ly about the vertical axisof the shaft 18. Fixed to one end of the boom is a cable 22 whichextends downwardly and is passed over a pulley 23 mounted on the housing11. From the pulley 23 the cable extends upwardly and is turned around apulley 24 on the booin 21 and is thence directed horizontally and passedaround a second pulley 25 carried by the outer end of the boom 21. Thecable' extends downwardly and is provided with an eye or book 26 adaptedfor the reception of a bail 27 carried by a suspended ash or refusereceptacle 28. It will be seen that by this arrangement of pulleys thereceptacle 28 will be raised or lowered at substantially twice the speedof vertical travel of th'escrew shaft 18.

To govern the operation of the motor 13 there is mounted on the underside of the door 5 a control switch 29 which in this instance has beenindicated as being of the knife variety. It will be seen that when thedoor is o pen theiswitch 29 will be conveniently aepessibl eywh'ereuponthe operator may close theswitch so as toenergize the motor 13.

permits the screw shaft to raise vertically," lift the boom 21 from ahorizontal position below the door 5 toan elevated position well abovethe sidewalk level, as indicated in Figure 1.. To provide for theautomatic stopping of the motor in the event the switch 29 is notoperated through any cause by the attendant, there is provided upon thecasing of the motor 13 a small oscillating type of switch 30. Theoperating arm of t 1:; switch is connected by means of a cable of rod 31with a spring 32 sus ended from one end of the boom 21. Thus w ien theboom reaches approximatel its extreme upper position of elevation t ecable or rod 31 is rendered taut and some tensionapplied to the sprin32,which results in the actuation of the switc 30 so as to open themotor circuit and to thereby arrest further upward movement of the screwshaft automatically. Similarly, when the boom descends to its lowermostpositiqn a flange 33 on the upper end of the screw, shaft contactswith apivoted switch arm 34 carried b a switch35 which is mounted on the housng 11. The switch 35 also operates under these conditions to open thembtor circuit and to thereby prevent possible dalna e to the operatingmechanism of the a hoist y failure on the part of the operator toactuatethe switch 29 at the roper time.

The lower end of the screw s iaft may be provided with a head 36 whichis receivable within the substantially square casing 7 as indicated inFigure 4. The head 36 prevents rotation on the part of the screw shaftand thereby permits of the raisin and lowering of the latter in responseto the forced rotation of the gear 16. The head 36 may be equipped withanti-friction rollers 37 to facilitate the rise and fall of the shaftwithin the casing. A lead 38 may be extended from a wall socket or othersource of energy to the motor 13 and likewise leads 39 may be extendedfrom said motor to the door switch 29.

The supplemental switch 35 is also operatedto automatically open themotor circuit by a bar 40 pivotally connected with the switch arm 34 inthe event the bucket comes into contact a'ccidentallywith' the sides ofthe cellarway opening, thus preventing injury to the operating mechanismthrough the automatic control.

What is claimed is:

1. In combination with motor driven hoisting apparatus for lifting abucketthrough' an opening, a switch arranged for controlling theoperation of said motor and a member pivotally carried by the lower edgeof said opening and cooperative with said switch and so arranged thatupon the failure of said bucket when raised to register with saidopening the switch will be opened and the upward movement of the bucketstopped.

2. In combination with: motor driven hoisting apparatus for lifting areceptacle through an opening, a switch arranged for controlling theoperation of said motor and a bar positioned at the side of said openingand pivotally connected with said switch and so arranged thatupon thefailure of said receptacle when lifted to register with said opening,said switch will be operated and the upward movement of the receptaclearrested.

3. In combination with motor driven hoistin apparatus for lifting areceptacle throng an opening, a switch arranged for controlling theoperation of said motor and a barpivot ally carried near the lower edgeof said opening and cooperative with said switch and so arranged thatupon the failure of. said receptacle when raised to register with saidopening the switch will be operated and the upward movement of thereceptacle arrested.

In testimony whereof I afiix my signature.

GUY R. BLACKVVOOD.

